Stone hurtled into holiday cottage (7)
I believe the answer is:
granite
'stone' is the definition.
(I've seen this before)
'hurtled into holiday cottage' is the wordplay.
'hurtled' becomes 'ran' ('hurtle' can mean to move at high speed).
'into' is an insertion indicator.
'holiday cottage' becomes 'gite' (type of holiday house in French).
'ran' going within 'gite' is 'GRANITE'.
(Other definitions for granite that I've seen before include "Hard stone from Tangier" , "Constituent in Dartmoor" , "Igneous rock, generally composed of feldspar and mica and quartz" , "Hard igneous rock" , "determination" .)